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Fortin et Hermann Hair Hygrometer

Description

This is a brass instrument with a silvered scale marked "Fortin et Hermann, Genve. [?] à Paris" and "Humidité" (humidity) and "Secheresse" (dryness) Nicholas Fortin, the senior member of the firm, was an instrument maker well known for his improved mercury barometer. The U.S. Military Academy bought this example in 1829.

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